Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 430, NWS Norman, OK

August 27, 2002Garvin County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 27, 2002, 4:54 AM CDT for Garvin County, Oklahoma. It was in force for 36 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 27, 2002, 4:54 AM CDT (09:54 UTC)
Expired
Aug 27, 2002, 5:30 AM CDT
In force
36 min
Issued by
NWS Norman, OK
Area
Counties, with a storm outline in the text

County Garvin County, OK

The radar

The Norman radar (KTLX), 73 km from the middle of the area, began a volume at 09:57 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 27, 5:00 AM CDTThunderstorm WindWynnewood, OKLarge tree limbs were downed.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 27, 1:30 AM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 9.9 hours before the alert went out and 62 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2002-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1167 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2002-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -41 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1167 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
1993 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-41 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-1.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

228 
WUUS54 KOUN 270954
SVROKC
OKC049-271030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
453 AM CDT TUE AUG 27 2002

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GARVIN COUNTY IN SOUTHERN OKLAHOMA

* UNTIL 530 AM CDT

* AT 453 AM CDT...DOPPLER RADAR DETECTED A LINE OF SEVERE
  THUNDERSTORMS FROM 7 MILES NORTHEAST OF PAULS VALLEY TO 12 MILES
  SOUTHWEST OF WYNNEWOOD...MOVING SOUTHEAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE ELMORE CITY...PAOLI...PAULS
  VALLEY...PERNELL AND WYNNEWOOD

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING WIND GUSTS OF 60 MPH. 
MOBILE HOMES AND HIGH PROFILE VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO 
HIGH WINDS AND MAY BE OVERTURNED. MOVE TO A STURDY BUILDING AND STAY 
AWAY FROM WINDOWS.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

LAT...LON 3454 9752 3453 9719 3470 9698 3486 9696
          3489 9726

11

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 26, 10:51 PM CDTSevere Thunderstorm WarningOUNHarper54 min
Aug 26, 11:46 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woodward59 min
Aug 27, 12:35 AM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Roger Mills, Woodward55 min
Aug 27, 1:00 AM CDTSevere Thunderstorm WarningOUNMajor60 min
Aug 27, 1:07 AM CDTSevere Thunderstorm WarningOUNCuster53 min
Aug 27, 1:32 AM CDTSevere Thunderstorm WarningOUNBlaine, Dewey43 min
Aug 27, 2:06 AM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Custer, Kingfisher, Washita54 min
Aug 27, 2:46 AM CDTSevere Thunderstorm WarningOUNGrady59 min
Aug 27, 2:49 AM CDTSevere Thunderstorm WarningOUNCleveland, McClain, Oklahoma41 min
Aug 27, 2:57 AM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Kiowa63 min
Aug 27, 3:19 AM CDTSevere Thunderstorm WarningOUNJackson, Tillman56 min
Aug 27, 3:30 AM CDTSevere Thunderstorm WarningOUNCleveland, Garvin, Grady, McClain, Stephens75 min
Aug 27, 3:46 AM CDTSevere Thunderstorm WarningOUNComanche, Cotton44 min
Aug 27, 4:21 AM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Murray69 min
Aug 27, 4:33 AM CDTSevere Thunderstorm WarningOUNCotton57 min
Aug 27, 5:05 AM CDTSevere Thunderstorm WarningOUNLove40 min
Aug 27, 5:28 AM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Johnston, Marshall62 min
Aug 27, 5:38 AM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Love, Murray37 min
Aug 27, 6:34 AM CDTSevere Thunderstorm WarningOUNBryan, Johnston, Marshall56 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2002Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.